> i think that using 1kb to cover that range is inefficient.
Actual memory is not being addressed here, it is just a register interface which uses the memory address interface for convenience.
The total address space spans 4GB, there isn't really a compelling reason for saving 1kB here and there.
A lot of other peripherals span 1kB or multiples thereof as well, presumably that was chosen as the minimum alignment space.
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